JPH10281283A - Transmission operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve water resistance and dust resistance and to ensure durability. SOLUTION: A transmission operating device comprises a cylinder housing 2; pistons 4 and 6 slidably contained in the cylinder housing; and an actuator 1A to partition a feed, discharge, suction pressure chamber 8a to effect suction of fluid in addition to the feed and discharge of fluid in and from the cylinder housing 2 and feed and discharge pressure chambers 8b and 9 to selectively effect the feed and discharge of fluid from each other. A plurality of passages on the cylinder side communicated with the respective pressure chambers is formed in the cylinder housing 2. Discharge of fluid from the respective pressure chambers through a check valve is effected. Orifices 33a, 63, and 64 are arranged as a throttle part in a suction discharge passage 33 communicated with the feed, discharge, suction pressure chamber 8a, and a check valve to block inflow to a discharge passage, communicated with a pressure chamber, from the outside is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission operating device, and is applicable to the improvement of both a select operation actuator and a shift operation actuator of a transmission operation device.

[0002]

2. Description of the Related Art In a bus or a truck having a large transmission, an actuator is incorporated in a transmission operation device so that a smooth transmission operation can be performed with a small force.

FIG. 14 shows that the applicant of the present invention has a Japanese Patent Application No. 8-323.
FIG. 15 is a longitudinal sectional view showing a shift operation actuator and a switching valve of the transmission operating device disclosed in Japanese Patent Application Publication No. 799;
Is a partially enlarged sectional view thereof. In the shift operation actuator 1, a cylinder hole 3a and a cylinder hole 3b having a larger inner diameter than the cylinder hole 3a are formed in a cylinder housing 2.

A main piston 4 is slidably housed in the smaller cylinder hole 3 a, and the main piston 4 is attached to a piston rod 5. A free piston 6 arranged on one end side of the piston rod 5 is housed in the larger cylinder hole 3b, and the main piston 4 and the free piston 6 and the partition 7 provided at an intermediate position are accommodated by the free piston 6. Three pressure chambers 8a, 8b, 9 are defined in the cylinder housing 2.

The actuator 1 includes a plurality of cylinder-side passages 30 to 34, 40, 41, 43 to 46 (see FIGS. 16 and 17) communicating with the corresponding pressure chambers 8a, 8b, 9 (see FIGS. 16 and 17). Formed in the housing 2,
The valve housings 18 and 19 have respective valve-side passages 36 and 3 communicating with the corresponding cylinder-side passages.
7, 52 to 57, 59, 72 (see FIGS. 17 and 18)
And three solenoid-operated switching valves MVa, MVb, MVc for switching to supply and discharge compressed air to and from the three pressure chambers 8a, 8b, 9 respectively. Installed.

The shift operation actuator 1 is configured such that compressed air from an air tank (not shown) is supplied to each of the electromagnetic switching valves M to the respective pressure chambers 8a, 8b, 9 via a corresponding passage.
It is supplied via Va, MVb and MVc. By supplying compressed air to the pressure chamber 9 at the end, the free piston 6 is positioned in contact with the partition 7, and by supplying compressed air to the pressure chamber 8 b, the piston rod 5 becomes free. The striker 13 that moves until it comes into contact with the piston 6 and moves with the piston rod 5 causes the receiving lever 15 to rotate about its axis 14. Thus, the main piston 4 is positioned at either the neutral position N ₁ to N ₃ shift pattern C shown in FIG. 14. When compressed air is supplied to the pressure chamber 8a from a state in which all the pressure chambers 8a, 8b, 9 are opened to the atmosphere, a shift operation of the shift pattern C to the position F is performed.
Further, when compressed air is supplied to the pressure chamber 8b from the state shown in FIG. 14, a shift operation to the position R side of the shift pattern C is performed.

[0007] Also for a select operation actuator disposed along the vertical direction with respect to the shift operation actuator 1, compressed air is supplied to each of the three pressure chambers via predetermined passages via respective electromagnetic switching valves. Then, the operating force is transmitted to an operating lever (not shown) to perform a selecting operation.

Each of the solenoid-operated switching valves MVa, MVb, MVc and each solenoid-operated switching valve of the select operation actuator open their corresponding pressure chambers to the atmosphere in a non-excited state (off) and respond in an excited state (on). Pressure chamber to be communicated with the air tank. The control of each electromagnetic switching valve is performed by a controller.

The shift operation actuator 1 and the select operation actuator are arranged so as to correspond to the shift pattern C shown in FIG. Therefore,
Only when the main piston 4 of the shift operation actuator 1 is at the intermediate position of the first cylinder hole 3a, the select operation actuator can be operated. Only when the receiving lever receiving the operation force from the select operation actuator in response to the operation of the shift lever is at a position corresponding to any of the positions N ₁ , N ₂ , and N ₃ of the shift pattern C, the shift operation actuator is operated. 1 is operable.

The pressure chamber 8a of the actuator 1
Is located between the pressure chamber 8 b and the pressure chamber 9, in addition to the pressure supply process performed through the passage 44 and the like during operation and the exhaust process performed through the discharge passage 33 at the time of opening after the operation, and the piston rod 5 by the free piston 6. Is pressed and the main piston 4 moves, there is an intake process performed through the passage 33. On the other hand, in the pressure chamber 8b and the pressure chamber 9, neither of the suction processes is performed, and the pressure supply process performed through the passages 45, 72 and the like during operation, and the exhaust hole 18c (FIG. Ref.) And the like.

[0011]

In the above-described actuator of the conventional transmission operating device, in the pressure chamber 8a, exhaust gas is blown into the atmospheric pressure chamber 62 inside the cylinder housing 2 and the momentum is strong. In addition, there is a problem that lubricant such as grease of the bearing portion 16 of the piston rod 5 is blown off to promote wear. The pressure chamber 8b and the pressure chamber 9 have a problem in that there is a possibility that water may enter due to a car wash or rain, and dust may enter.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and has as its object to improve the water resistance and dust resistance, to prevent the lubricant from being blown off, and to ensure the durability. An operation device is provided.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a cylinder housing and a piston slidably housed in the cylinder housing, and the piston is inserted into the cylinder housing by the piston. An actuator having a plurality of pressure chambers is provided, and a plurality of cylinder-side passages communicating with the plurality of pressure chambers are formed in the cylinder housing, and supply and discharge of a fluid to the plurality of pressure chambers are selected. A transmission operating device, which is provided with a check valve for preventing inflow from the outside into each of the discharge passages communicating with the plurality of pressure chambers, and discharging the fluid from each of the pressure chambers through the check valve. Is performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission operating device according to an embodiment of the present invention will be described in detail with reference to the drawings, taking as an example a case where the invention is applied to a shift operation actuator. FIG. 1 is a partial cross-sectional view of a main part of a shift operation actuator and an electromagnetic switching valve of a transmission operating device according to an embodiment of the present invention, which is longitudinally cut at substantially center positions thereof, and FIG. 3 is a front view of FIG. 1, FIG. 4 is a partial plan view of FIG. 1, and FIG. 5 is a cross-sectional view of FIG. 1, all of which are shown in FIGS. The same reference numerals are given to the same or corresponding parts as in the conventional case.

The shift operating actuator 1A of the transmission operating device comprises a main piston 4 attached to a hollow piston rod 5, a free piston 6, and a partition 7
The supply / discharge suction pressure chamber 8a in which suction is performed in addition to the supply and discharge of fluid into the cylinder housing 2, the supply / discharge pressure chamber 8b in which supply and discharge of fluid are selectively performed, and the supply / discharge pressure chamber 9 Are defined, and these pressure chambers 8a, 8b, 9
The valve housings 18 and 19 are provided with three electromagnetic switching valves MVa, MVb (see FIG. 4) and MVc for switching to supply and discharge compressed air as a pressure fluid.

Further, the shift operation actuator 1A
Are a plurality of cylinder-side passages 30 to 34, 40, 41, 43 communicating with the corresponding pressure chambers 8a, 8b, 9 respectively.
Are formed in the cylinder housing 2, and the valve housings 18 and 19 have respective valve-side passages 36, 37 and 5 communicating with the corresponding cylinder-side passages.
2 to 57, 59 and the like, and an orifice 33a as a throttle of the suction / discharge passage 33 communicating with the supply / discharge suction pressure chamber 8a and an orifice 63, as a throttle of another suction / discharge passage.
64, the supply / discharge suction pressure chamber 8a and the supply / discharge pressure chamber 8b,
Non-return valves 23, 24, 25 (see FIGS. 3 and 5) are provided for preventing the inflow of air from the outside into the discharge passage communicating with the discharge passage 9, and air is discharged from the corresponding pressure chambers through these check valves. It is supposed to do. The shift operation actuator 1A and the select operation actuator are operated by compressed air supplied from an air tank (not shown).

Further, a shift operation actuator 1A
The cylinder housing 2 comprises a first block 11;
The valve housings 18 and 19 are respectively provided on the side surface of the first block 11 and the end of the second block 12 by sandwiching the flange 7a of the partition 7 between the second block 12 and the second block 12. Two pressure chambers 8 a and 8 b are defined in the first block 11 by the main piston 4 and the partition 7, and the pressure chamber 9 on the free piston 6 side is defined in the second block 12. It is defined. A main piston 4 is provided in the cylinder housing 2.
And a stopper 49d for the free piston 6 are provided, and the valve housing 19 has a common supply port 19b.

The cylinder housing 2 has a thick wall 1 on one side surface of the first block 11 and the second block 12.
As shown in FIG. 2, a supply common passage 30 is formed in the thick walls 11a, 12a and the valve housing 19 in parallel with the axis and at intervals. Two supply / discharge passages 31 and 32 and one suction / discharge passage 33 are formed in the thick wall 11a of the block 11;
Another supply / discharge passage 34 is formed in the end wall 12 b of the second block 12. The valve housing 19 is provided with a valve-side supply passage 36 branching at a right angle from the common passage 30.

As shown in FIG. 5, the check valve 25 for the supply / discharge pressure chamber 9 has a cylindrical body 26 communicating with a corresponding discharge passage 79 provided in the valve housing 19, and a valve seat 26 at a tip end thereof.
a exhaust valve body 27 that comes in contact with and separates from the valve body a, and a compression spring 28 that urges the exhaust valve body 27 in a seating direction. The cover 29 covers the exhaust valve body 27, the compression spring 28, and the like. A male screw 26b on the outer periphery of the body 26 is screwed into a screw hole 19e of the valve housing 19, and is screwed upward to the mounting seat surface 19d of the valve housing 19. Then, only at the time of exhaust, the check valve 25 separates the exhaust valve body 27 from the valve seat 26a against the urging force of the compression spring 28 and opens the exhaust passage 79 to the atmosphere. The other two check valves 23 and 24 are attached to the valve housing 18 as shown in FIG.
The corresponding supply / discharge suction pressure chamber 8a and supply / discharge pressure chamber 8b
Mounting surface 1 perpendicular to the discharge passages 77 and 78 communicating with the
Since the check valve 25 is the same as the above-described check valve 25 except that the cylindrical body 26 is screwed into the screw hole 18e formed in 8d, the same portions are denoted by the same reference numerals, and redundant description will be omitted.

The supply common passage 30 is connected to the supply port 19.
b and straight through to a position in the middle of the thick wall 11a of the first block 11, and as shown in FIGS. 1 and 2, the respective orthogonal passages 40 and 41 continue at the end and intermediate positions, respectively. The orthogonal passage 40 at the end, the valve-side supply passage 52 connected thereto, and the subsequent branch passage 5 shown in FIG.
4, 55, etc., and the corresponding electromagnetic switching valves MV
a, MVb communicates with the valve chamber 97 and further connects the main piston 4
The electromagnetic passages MVa and MVb respectively engage with the pressure chambers 8a and 8b on both sides of the solenoid valve MVa and MVb through the valve-side supply passage 53 and the branch passages 56 and 57 shown in FIG. In the working pressure chamber 51.

In FIG. 2, two parallel long and short cylinder supply / discharge passages 31 and 32 on both sides of the common passage 30 are continuous from one end of the first block 11 in contact with the partition 7 to an intermediate position. And orthogonal passages 43 to 46 which are orthogonal to each other at an intermediate position, and orthogonal passages 43 and 46 which are orthogonal to the end of the shorter supply / discharge passage 31 and the intermediate position of the longer supply / discharge passage 32 respectively. Electromagnetic switching valves MVa, MVb
Each of the orthogonal passages 44 and 45 which are connected to the supply / discharge passage 59 which communicates with the outlet of the short supply / discharge passage 31 and which are orthogonal to each other at an intermediate position of the shorter supply / discharge passage 31 and at an end of the longer supply / discharge passage 32, respectively. It is connected to the chambers 8a and 8b. In FIG. 2, the cylinder-side suction / discharge passage 33 is continuous from one end of the first block 11 to a position corresponding to the atmospheric pressure chamber 62, and an orifice 63 that is orthogonal at the intermediate position has a valve-side orifice 64.
It is connected to the. Then, the cylinder side suction / discharge passage 3
3 is an atmospheric pressure chamber 62 through an orthogonal orifice 33a.
Is in communication with

The two electromagnetic switching valves MVa and MVb corresponding to the two pressure chambers 8a and 8b are provided in a common valve housing 18 as shown in FIG. 4, and are provided on the outer surface of the thick wall 11a of the first block 11. An annular seal member 91 surrounding the outer periphery of the passage in the mutual connection portion is attached between the first block 11 and the valve housing 18 in a sandwich structure. The electromagnetic switching valves MVa and MVb each include a switching valve body 85, a valve lifter 86, a fixed member 87 having a valve seat 87a formed thereon, and a pair of electromagnetic valve bodies 89 urged in directions away from each other by a compression spring 88. And an electromagnetic coil 90 and the like. The pair of solenoid valve elements 89 are housed in a common cylinder 94,
The cylinder 94 is urged in the direction of the valve seat 87a by a compression spring 95 disposed on the outer periphery thereof. The valve housing 18 has a valve chamber 97 having one end sealed with a plug 96.
A supply / discharge passage 59 communicating with a spring chamber 93 of a compression spring 92 for urging a valve lifter 86;
As shown in FIG. 6, the supply passage 52 communicating with the valve chamber 97 is provided.
7, an orifice 64 communicating with a hole in which the valve lifter 86 slides, and a supply passage 53 communicating with an annular space 81 on the outer periphery of the fixing member 87, as shown in FIG.
And each of these passages is connected to a corresponding cylinder-side passage.

The valve lifter 86 integrally has a small-diameter pressing portion 86a and is urged by a compression spring 92 disposed on the outer periphery of the small-diameter pressing portion 86a. And a plurality of radial holes 86c subsequent thereto. The center hole 86b of the valve lifter 86 in the electromagnetic switching valve MVa communicates with the suction / discharge passage 33 and the exhaust passage 77 via the orifice 64 of the valve housing 18 and the orifice 63 opened in the cylinder housing 2, and the electromagnetic switching valve MVb The center hole 86 b of the valve lifter 86 communicates with a corresponding exhaust passage 78 opened in the valve housing 18. As shown in FIG. 4, the fixing member 87 has a valve seat 87 a with which the electromagnetic valve element 89 comes in contact with and separates from the valve seat 87 b. And one end is valve seat 8
A straight communication hole 87c that opens in the annular space 82 on the outer periphery of 7a and opens in the working pressure chamber 51 between the other end and the valve lifter 86.
And

As shown in FIG. 1, an electromagnetic switching valve MVc corresponding to the pressure chamber 9 on the free piston 6 side is provided on an outer surface of the end wall 12b of the cylinder housing 2 with an annular seal surrounding the outer periphery of the passage at the mutual connection portion. A member 91 is arranged and attached, as shown in FIG. 5, a solenoid valve element 89 and an electromagnetic coil 90, a switching valve element 85 in the valve housing 19,
The supply passage 36 communicates with an annular space 81 on the outer periphery of the fixing member 87, including a valve lifter 86 and a fixing member 87. In the valve housing 19, a valve seat 19a is formed in a valve chamber 97 one end of which is closed by a plug 96. As shown in FIG. 9, the supply passage 36 communicates with the valve chamber 97 via a passage 98 orthogonal to the valve seat 97. As shown in FIG.
An exhaust passage 79 communicates with a hole through which the sliding member 6 slides, and as shown in FIG.
As shown in FIG. 7, the supply / discharge passage 72 communicates with a spring chamber 93 of a compression spring 92 for urging the valve lifter 86 and is connected to the corresponding supply / discharge passage 34 on the cylinder side shown in FIG.

The valve lifter 86 integrally has a small-diameter pressing portion 86a, and is urged in a direction away from the switching valve body 85 by a compression spring 92 disposed on the outer periphery of the small-diameter pressing portion 86a. Center hole 86 from the tip to the middle
b and a plurality of radial holes 86c following it.
8 is connected. The fixing member 87 has a valve seat 87a with which the electromagnetic valve element 89 comes in contact with or separates from the valve seat 87a.
b, and a straight communication hole 87c having one end open to the annular space 82 on the outer periphery of the valve seat 87a and the other end continuing to the supply passage 36. The bent communication hole 87b is connected to the supply passage 36 via an annular space 81 on the outer periphery of the fixing member 87, and the straight communication hole 8b
7c is open to the working pressure chamber 51 formed between the valve lifter 86 and the fixing member 87.

When the electromagnetic switching valve MVa is turned on, the electromagnetic coil 9 is turned on.
When 0 is excited, the electromagnetic valve element 89 separates from the valve seat 87a. Accordingly, the compressed air constantly supplied to the supply port 19b is supplied to the common passage 30, the supply passages 41 and 53 on the cylinder side and the valve side, the branch passage 56, the annular space 81, the bent communication hole 87b, and the straight communication hole 87c. To reach the working pressure chamber 51. When the pressure in the working pressure chamber 51 is increased, the valve lifter 86 slides against the urging force of the compression spring 92 and presses the switching valve body 85 to separate it from the valve seat 18a. Compressed air is supplied to the common passage 30 and the supply passages 4 on the cylinder side and the valve side.
0, 52, and enters the valve chamber 97 through the branch passage 54. Further, the compressed air is supplied to the supply and discharge passages 59 and 34 on the valve side and the cylinder side, the shorter cylinder side passage 31 and the pressure chamber 8.
The pressure is supplied to the pressure chamber 8a through a passage 44 opening to the pressure chamber a, and is exhausted from the other pressure chamber 8b through a check valve 24. The operation of the solenoid-operated switching valve MVb is substantially the same as described above, and a description thereof will be omitted.

The operation itself of the electromagnetic switching valve MVc is the same as described above. That is, when the electromagnetic coil 90 is energized in the ON state, the electromagnetic valve element 89 separates from the valve seat 87a. Thus, the compressed air constantly supplied to the supply port 19b reaches the working pressure chamber 51 through the common passage 30, the supply passage 36, the annular space 81, the bent communication hole 87b, and the straight communication hole 87c. The pressure in the working pressure chamber 51 increases the valve lifter 8.
6 slides against the urging force of the compression spring 92, and the switching valve body 8
5 is pushed away from the valve seat 19a, so that the compressed air constantly supplied to the supply port 19b enters the valve chamber 97 through the supply passage 36. In addition, this compressed air
The pressure is supplied to the pressure chamber 9 on the free piston 6 side through the supply and discharge passages 72 and 34 on the valve side and the cylinder side, and slides the free piston 6. When this movement causes the piston rod 5 and the main piston 4 to move leftward in FIG. 1, air is sucked into the pressure chamber 8a. This air inhalation
This is performed through the orifice 33a and the orifice 64 and the orifice 63 following the orifice 64.

In the actuator 1A according to the above embodiment of the present invention, since the check valves 23 to 25 are all mounted upward, there is no possibility that the cover 29 will be crushed during transportation or the like. Since the necessary passages are formed and the passages corresponding to the valve housings 18 and 19 are formed and the solenoid-operated switching valve is mounted on the cylinder housing 2, there is no need for external piping, and the size is easily reduced. There is.

The operation of the transmission operating device according to the above-described embodiment of the present invention is the same as that of the conventional one shown in FIG.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, the present invention can be applied not only to the shift operation actuator 1A but also to the select operation actuator. When the free piston 6 is provided at both ends of the cylinder housing 2, the suction / discharge passage is provided to each of the electromagnetic switching valves MVa and MVb. It is desirable to provide each of them, and when adding an electromagnetic switching valve, both side surfaces of the cylinder housing 2 may be made thick walls. Also, the orifices 63 and 6 as the throttle portion
A check valve 69 as shown in FIG. In this case, a notch 69c is provided in a part of the valve seat 69b where the valve body 70 in the valve chamber 69a contacts and separates. Inhalation is performed smoothly.

[0031]

According to the present invention, the plurality of pressure chambers include a supply / discharge pressure chamber for selectively supplying and discharging a fluid, and a flow from the outside into a discharge passage communicating with the supply / discharge pressure chamber is provided. By providing a check valve for blocking, and discharging the fluid from the respective pressure chambers through the check valve, inflow from the outside to the discharge passage is prevented by the check valve, so that water resistance and dust resistance are improved. There is an effect that it can be improved. In addition, the plurality of pressure chambers include a supply / discharge suction pressure chamber in which suction is performed in addition to supply and discharge of the fluid, and a throttle section is provided in a suction / discharge passage communicating with the supply / discharge suction pressure chamber, so that exhaust is performed. Since the diaphragm is sometimes squeezed by the squeezing portion, it is possible to prevent the lubricant from flying and to ensure durability.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a main part of a shift operation actuator and a switching valve of a transmission operating device according to an embodiment of the present invention, which is longitudinally cut at respective center positions.

FIG. 2 is a partial end view in a cross section taken along line AA of FIG. 1;

FIG. 3 is a front view of the switching valve of FIG. 1 with a part thereof removed;

FIG. 4 is a plan sectional view at a position passing through the center of the switching valve of FIG. 1;

FIG. 5 is a cross-sectional view of FIG.

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a sectional view taken along the line CC of FIG. 4;

FIG. 8 is a sectional view taken along the line DD of FIG. 4;

FIG. 9 is a sectional view taken along line EE in FIG. 5;

FIG. 10 is a sectional view taken along the line FF of FIG. 5;

FIG. 11 is a sectional view taken along line GG of FIG. 5;

FIG. 12 is an enlarged sectional view taken along line HH of FIG. 1;

FIG. 13 is a partial sectional view showing a modification of the present invention.

FIG. 14 is a vertical cross-sectional view of a shift operation actuator and a switching valve of a conventional transmission operation device at a center position, which shows the entirety thereof.

FIG. 15 is a partial cross-sectional view showing a main part of FIG.

FIG. 16 is a sectional view taken along the line II of FIG. 15;

FIG. 17 is a cross-sectional view of FIG.

FIG. 18 is a sectional view taken along line JJ of FIG.

[Explanation of symbols]

 MVa to MVc Solenoid switching valve 1A Actuator for shift operation 2 Cylinder housing 4 Main piston 5 Piston rod 6 Free piston 7 Partition wall 8a Supply / discharge suction pressure chamber 8b, 9 Supply / discharge pressure chamber 18 Valve housing 30 Common passage for supply 31, 32 cylinder-side supply / discharge passage 33 cylinder-side suction / discharge passage 33a orifice (throttle portion) 34 cylinder-side supply / discharge passage 36, 37 valve-side supply passage 40-46 orthogonal passage 51 working pressure chamber 52,53 supply passage 54-57 branch Passage 59 Supply / discharge passage 63, 64 Orifice (throttle portion) 66 Annular seal member 72 Supply / discharge passage

Claims (2)

[Claims] An actuator having a cylinder housing and a piston slidably housed in the cylinder housing, the piston having a plurality of pressure chambers defined in the cylinder housing; Forming a plurality of cylinder-side passages communicating with the plurality of pressure chambers, wherein the supply and discharge of fluid to and from the plurality of pressure chambers are selectively performed; A transmission operating device, comprising: a check valve for preventing an inflow from the outside into each of the communicating discharge passages; and discharging the fluid from each of the pressure chambers through the check valve. 2. The plurality of pressure chambers include a supply / discharge suction pressure chamber for performing suction in addition to supply and discharge of a fluid, and a throttle portion is provided in a suction / discharge passage communicating with the supply / discharge suction pressure chamber. The transmission operating device according to claim 1, wherein: